How do I dynamically embed the iframe into the ASP.NET code?

add an id="myIframe" and runat="server" to the <iframe ... ></iframe> and you will be able to access it from code

...

myIframe.attributes.add("src", "http://www.mydomain.com")

But I cannot find iframe control in ASP.NET.
<asp:iframe id="myFrame" runat="Server"></asp>
or
<iframe id="myFrame" runat="Server"></iframe>

???

I am away from my development PC so just cannot test it. Do you have tested code to share?

Thanks,

I mean sample code?

in HTML
        <iframe id="myIframe" runat="server" visible="true" width="400px" height="600px"></iframe>

In code behind
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim iFrameControl As HtmlControl = CType(Me.FindControl("myIframe"), HtmlControl)
        iFrameControl.Attributes.Add("src", "http://google.ca")
End sub

once your page load the iframe will load google.ca

HTH

May I see the "Register" Line (in HTML)?

Are you creating the user control?

there are not asp:somecontrol versions for every html tag out there, iframe is one of them.  For controls like this, you can still add an id/runat="server", and if you wanted to use them in code, they are considered a HtmlGenericControl

I received a runtime error:  Object reference not set to an instance of an object. And point to the line of
frameTop.Attributes["src"] = "http://search.msn.com";

What is wrong with the code?

Here is the code:
   
//protected System.Web.UI.HtmlControls.HtmlGenericControl frameTop;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            HtmlControl frameTop = (HtmlControl)this.FindControl("frameTop");
            frameTop.Attributes["src"] = "http://search.msn.com";

        }
    }

<asp:Content ID="Content2" ContentPlaceHolderID="TopArea" Runat="Server">
<iframe id="frameTop" runat="Server"  title = "SOMETHING" width = 100%></iframe>
</asp:Content>

Thanks